Bandwidth Part Synchronization for 5G Uplink Access
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Solution Overview
Problem
In 5G New Radio (NR) wireless communication networks, network devices and terminal devices may have different understandings of Bandwidth Part (BWP) frequency-domain resources, leading to signal loss during uplink access procedures.
Innovation Solution
A method and device for synchronizing BWPs, where a terminal device determines and activates the correct BWP for each uplink access procedure, and a network device configures BWPs for multiple uplink access procedures to ensure consistent understanding between devices.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If the terminal device uses different BWPs for different uplink access procedures, then the bandwidth usage is optimized, but the network device and terminal device may have different understandings of BWP frequency-domain resources, leading to signal loss
Solution Approach 1:
The terminal device activates the BWP in advance before the uplink access procedure starts. By determining and activating the first BWP corresponding to the first uplink access procedure before actually performing the procedure, the terminal ensures that both the terminal and network have consistent understanding of which BWP is being used, preventing signal loss while maintaining optimized bandwidth usage
Solution Approach 2:
The patent establishes a feedback mechanism where the terminal device reports the activated BWP information to the network device. This feedback loop ensures that the network device has accurate information about which BWP the terminal is using, resolving the misunderstanding that leads to signal loss while allowing the terminal to continue using different BWPs for different procedures
2Reliability
If the terminal device determines and activates the correct BWP for each uplink access procedure, then signal transmission reliability is improved, but the device complexity increases
Solution Approach 1:
The terminal device uses a unified BWP determination method that applies to all uplink access procedures (RACH procedure, SDT procedure, CG SDT procedure, etc.). Instead of having separate complex determination logic for each procedure type, the terminal uses a consistent approach of determining the BWP based on the procedure type and activating it beforehand, which simplifies the overall complexity while maintaining reliability
Data Source
AI summary
A method for synchronizing bandwidth parts (BWPs), performed by a terminal device, includes: determining BWPs configured for two or more uplink access procedures; and determining to perform a first uplink access procedure, and activating a first BWP corresponding to the first uplink access procedure, in which the first uplink access procedure is any one of the two or more uplink access procedures.